ASTM A790/A790M S31200 Introduce
The ASTM A790/A790M steel standard outlines requirements for materials, fabrication, testing and inspection in order to ensure the safety and quality of pipework when used for its intended purpose. The standard provides detailed requirements on weld joint design, welding procedure, weldability, and mechanical properties.
Smelting temperature:1614°C - 1311°C
Application:Seamless and welded ferritic/austenitic stainless steel tube
ASTM A790/A790M S31200 Material Chemical Composition
The chemical composition of the ASTM A790/A790M S31200 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 1.0000 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0450 |
| Nickel (Ni) | 5.5000 | 6.5000 |
| Nitrogen (N) | 0.1400 | 0.2000 |
| Molybdenum (Mo) | 1.2000 | 2.0000 |
| Manganese (Mn) | - | 2.0000 |
| Chromium (Cr) | 24.0000 | 26.0000 |
| Carbon (C) | - | 0.0300 |
ASTM A790/A790M S31200 Material Mechanical Properties
The hardness of a material can also be an important factor to consider. ASTM A790/A790M S31200 steel is highly resistant to abrasion, therefore it has excellent hardness. The material also has excellent impact fatigue resistance and can withstand impacts over long periods of time.
The mechanical properties of the ASTM A790/A790M S31200 steel are as follows:
| YieldRp0.2 | ≤ 174 (MPa) |
| TeileRm | ≤ 326 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 113 |
ASTM A790/A790M S31200 Material Thermal Properties
The thermal performance parameters of the ASTM A790/A790M S31200 steel are as follows:
| Temperature (°C) | 34 | 452 | 395 |
| Modulus of elasticity (GPa) | - | 219 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 42 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 31.2 |
| Specific thermal capacity (J/kg·°C) | - | 442 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 123 |
| Poisson’s coefficient, ν | - | - | 134 |
ASTM A790/A790M S31200 Material Machining Technology
The use of coolants can be beneficial when machining ASTM A790/A790M S31200 steel. Coolants help to reduce the tool wear by keeping the heat generated during the machining process under control. Additionally, the use of a coolant will reduce the time required for the machining process and increase overall accuracy and precision. A water-based coolant is usually recommended, as it will reduce the risk of fire when machining and also extend the life of the cutting tools.